MFJ-869 MFJ Giant automatic SWR/Wattmeter Instruction Manual
© 2009-2010 MFJ Enterprises, Inc.
1
The Basics
Introduction
The MFJ-869 Giant automatic SWR/Wattmeter measures up to 1500 watts. It has three high- resolution
ranges with accuracy in each range from 1.8 to 54 MHz. True peak or average forward or reflected watts
or SWR can be displayed on a huge lighted single-needle SWR/wattmeter.
PeakHold
TM
feature freezes the highest forward power for one, two or three seconds. These analog
displays make it visually easy to tune antenna tuners, amplifiers and transmitters.
There are three high-resolution forward/reflected power ranges that are automatically selected: a QRP
range (20 watts full scale), a mid-range (200 watts full scale) and a high-range (1500 watts full scale).
TrueActive
TM
peak reading circuit gives true peak or average power on all modes.
The MFJ-869 includes MFJ’s Amplifier Bypass Control
TM
. This exclusive MFJ feature protects your
amplifier by taking your amplifier off-line should the SWR increase above a user-defined pre-set limit.
There is also a relay connector with normally open and normally closed connections that toggle when the
SWR is above the same pre-set limit.
The MFJ-869 enters a “sleep” mode when idle and when no transmit signal is present, turning off the
microprocessor clock to avoid the generation of spurious signals.
Features
• Power range of 20, 200 or 1500 watts
• 1.8 to 54 MHz continuous frequency coverage
• Adjustable alarm SWR from 1.5 to 3.0 in 0.5 steps
• Amplifier Bypass Control
TM
automatically protects your amplifier during high SWR events
• Lighted single-needle SWR/wattmeter with fixed or auto ranging
• Peak or average power mode
• Built-in frequency counter
• Built-in bootloader for field upgradeable firmware
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